////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2011-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <QChildEvent>
#include <QVBoxLayout>

#include "Canvas.h"
#include "Container.h"
#include "Object.h"
#include "QtHandlesUtils.h"

#include "graphics.h"
#include "interpreter.h"

namespace octave
{

  Container::Container (QWidget *xparent, octave::base_qobject& oct_qobj,
                        octave::interpreter& interp)
    : ContainerBase (xparent), m_octave_qobj (oct_qobj),
      m_interpreter (interp),  m_canvas (nullptr)
  {
    setFocusPolicy (Qt::ClickFocus);
  }

  Container::~Container (void)
  { }

  Canvas*
  Container::canvas (const graphics_handle& gh, bool xcreate)
  {
    if (! m_canvas && xcreate)
      {
        gh_manager& gh_mgr = m_interpreter.get_gh_manager ();

        octave::autolock guard (gh_mgr.graphics_lock ());

        graphics_object go = gh_mgr.get_object (gh);

        if (go)
          {
            graphics_object fig = go.get_ancestor ("figure");

            m_canvas = Canvas::create (m_octave_qobj, m_interpreter, gh, this,
                                       fig.get ("renderer").string_value ());

            connect (m_canvas, QOverload<const octave::fcn_callback&>::of (&Canvas::interpreter_event),
                     this, QOverload<const octave::fcn_callback&>::of (&Container::interpreter_event));

            connect (m_canvas, QOverload<const octave::meth_callback&>::of (&Canvas::interpreter_event),
                     this, QOverload<const octave::meth_callback&>::of (&Container::interpreter_event));

            connect (m_canvas,
                     SIGNAL (gh_callback_event (const graphics_handle&,
                                                const std::string&)),
                     this,
                     SIGNAL (gh_callback_event (const graphics_handle&,
                                                const std::string&)));

            connect (m_canvas,
                     SIGNAL (gh_callback_event (const graphics_handle&,
                                                const std::string&,
                                                const octave_value&)),
                     this,
                     SIGNAL (gh_callback_event (const graphics_handle&,
                                                const std::string&,
                                                const octave_value&)));

            connect (m_canvas,
                     SIGNAL (gh_set_event (const graphics_handle&,
                                           const std::string&,
                                           const octave_value&)),
                     this,
                     SIGNAL (gh_set_event (const graphics_handle&,
                                           const std::string&,
                                           const octave_value&)));

            connect (m_canvas,
                     SIGNAL (gh_set_event (const graphics_handle&,
                                           const std::string&,
                                           const octave_value&, bool)),
                     this,
                     SIGNAL (gh_set_event (const graphics_handle&,
                                           const std::string&,
                                           const octave_value&, bool)));

            connect (m_canvas,
                     SIGNAL (gh_set_event (const graphics_handle&,
                                           const std::string&,
                                           const octave_value&, bool, bool)),
                     this,
                     SIGNAL (gh_set_event (const graphics_handle&,
                                           const std::string&,
                                           const octave_value&, bool, bool)));

            QWidget *canvasWidget = m_canvas->qWidget ();

            canvasWidget->lower ();
            canvasWidget->show ();
            canvasWidget->setGeometry (0, 0, width (), height ());
          }
      }

    return m_canvas;
  }

  void
  Container::resizeEvent (QResizeEvent* /* event */)
  {
    if (m_canvas)
      m_canvas->qWidget ()->setGeometry (0, 0, width (), height ());

    gh_manager& gh_mgr = m_interpreter.get_gh_manager ();

    octave::autolock guard (gh_mgr.graphics_lock ());

    for (auto *qObj : children ())
      {
        if (qObj->isWidgetType ())
          {
            Object *obj = Object::fromQObject (qObj);

            if (obj)
              {
                graphics_object go = obj->object ();

                if (go.valid_object ())
                  {
                    Matrix bb = go.get_properties ().get_boundingbox (false);

                    obj->qWidget<QWidget> ()->setGeometry
                      (octave::math::round (bb(0)),
                       octave::math::round (bb(1)),
                       octave::math::round (bb(2)),
                       octave::math::round (bb(3)));
                  }
              }
          }
      }
  }

  void
  Container::childEvent (QChildEvent *xevent)
  {
    // Enable mouse tracking in child widgets as they are added if the
    // container also has mouse tracking enabled.  There is no need to
    // do this when child objects are removed.

    if (xevent->added ())
      {
        QObject *obj = xevent->child ();

        if (obj && obj->isWidgetType ())
          {
            QWidget *widget = qobject_cast<QWidget *> (obj);

            if (widget)
              widget->setMouseTracking (hasMouseTracking ());
          }
      }
  }
}
